A method for quantitatively researching the predation effect of field surface enemies on pests

Abstract

The invention discloses a method for quantitatively researching the predation effect of field surface natural enemies on pests. The quantitative evaluation method comprises the steps of arrangement ofan inducing and preying device, prey preying / attack investigation simulation and prey preying / attack intensity calculation simulation. The method is carried out under the field environment condition;serious artificial interference of a classic nylon net cage method on a field test is avoided; according to the occlusion trace, preliminarily judging the types of the surface natural enemies which are launched and predatory; the predatory effect of ground surface enemies on pests is quantitatively studied by using the frequency / intensity of predatory / attack of the pest simulant, the size of thepredatory effect of the ground surface enemies on the pests of a farmland ecosystem in different regions or under different managements can be objectively reflected, and the accuracy and scientificityof an evaluation result are outstanding. The method disclosed by the invention is simple and feasible, low in cost and high in operability, and has good applicability in quantitative research on thepredation effect of field surface natural enemies on pests.

Description

technical field [0001] The invention belongs to the field of agricultural biological prevention and control detection, and relates to a method for quantitatively studying the predation effect of natural enemies on the field surface on pests. Background technique [0002] Pests are an important factor that threatens agricultural production. They not only directly feed on crop tissues, but also cause wounds to facilitate disease infection. Many pests can also spread various plant viruses, resulting in severe crop yield reduction and a decline in the quality of agricultural products. For a long time, chemical control has been the main measure of agricultural pest management. Extensive use of chemical pesticides has led to environmental pollution, increased planting costs, natural enemy killing, different degrees of resistance to pesticides, and pest re-emergence. There are a large number of natural enemies in the farmland ecosystem. After a long-term co-evolution process, a com...

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Problems solved by technology

Chinese patent documents CN102260507A and CN106447512A disclose two field detection methods of the control ability of predatory natural enemies to rice planthoppers, both of which use the field nylon net covering method, although quantitative evaluation of the control ability of predatory natural enemies to rice planthoppers in the field can be realized , but the nylon net cage will change the internal microenvironment (such as light intensity, temperature, humidity and wind speed, etc.), these changes may change the physiological state of the caged plants and the behavior and development of herbivores, and the lower temperature reduces the prey growth and activity, thus increasing the probability of being predated

In addition, nylon mesh enclosures can also alter the behavior of predators or prey, confining both predators and prey within nylon mesh enclosures, as predators cannot migrate out, repeating previously searched locations, potentially increasing predation rates

The evaluation of the control effect of predatory natural enemies on pests based on nylon nets is often reflected by the degree of suppression of the pest population size. There has been a lack of effective methods for field quantitative research on the predation effect of surface natural enemies on pests.

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